Gwent's Police and Crime Commissioner and Gwent Police's former chief constable will appear before the Home Affairs Select Committee in London later.
Both parties will give their side of events that led to Mrs Napier's departure at the meeting in Westminister this afternoon.
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Darren Osborne from Pentwyn, Cardiff was arrested by police in the early hours of Monday after allegedly ramming his van into worshipers.
A landlord has been fined at Cardiff Magistrates Court after pleading guilty to 8 charges relating to a property in Albany Road, Cardiff.
Owner Maria Caulfield, 32, was stunned when the toy from her son's bow and arrow set vanished as eight-week-old Lola played in the house.